1. Diamonds have an affinity for grease. Touch the diamond to grease and it will stick. You can actually feel it being pulled to sticking.
Try it on “butter”, then try a different gemstone and you will see and feel the difference.
2. Another test is the scratch test. A diamond will scratch, but nothing will scratch a diamond.
Info gleaned from the Diamond exhibition at the Royal Ontario Museum, Toronto. ON. Canada
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